Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Earthquakes and Structures Volume 13, Number 2, August 2017 , pages 119-130 DOI: https://doi.org/10.12989/eas.2017.13.2.119 |
|
|
|
Seismic behavior of isolated bridges with additional damping under far-field and near fault ground motion |
||
Daniele Losanno, Houman A. Hadad and Giorgio Serino
|
||
| Abstract | ||
| This paper presents a numerical investigation on the seismic behavior of isolated bridges with supplemental viscous damping. Usually very large displacements make seismic isolation an unfeasible solution due to boundary conditions, especially in case of existing bridges or high risk seismic regions. First, a suggested optimal design procedure is introduced, then seismic performance of three real bridges with different isolation systems and damping levels is investigated. Each bridge is studied in four different configurations: simply supported (SSB), isolated with 10% damping (IB), isolated with 30% damping (LRB) and isolated with optimal supplemental damping ratio (IDB). Two of the case studies are investigated under spectrum compatible far-field ground motions, while the third one is subjected to near-fault strong motions. With respect to different design strategies proposed by other authors, results of the analysis demonstrated that an isolated bridge equipped with HDLRBs and a total equivalent damping ratio of 70% represents a very effective design solution. Thanks to confirmed effective performance in terms of base shear mitigation and displacement reduction under both far field and near fault ground motions, as well as for both simply supported and continuous bridges, the suggested control system provides robustness and reliability in terms of seismic performance also resulting cost effective. | ||
| Key Words | ||
| seismic response; isolated bridges; optimal design; near-fault; elastomeric bearings; supplemental damping | ||
| Address | ||
| Daniele Losano and Giorgio Serino: Department of Structures for Engineering and Architecture, University Federico II, Via Claudio 21, 80125, Naples, Italy Houman A. Hadad: Department of Civil Architectural and Environmental Engineering, University of Miami, Florida, USA | ||